discourse/app/assets/stylesheets/common/base/emoji.scss

img.emoji {
  width: 20px;
  height: 20px;
  vertical-align: middle;
}

.emoji-picker {
  background-clip: padding-box;
  z-index: z("modal","content"); 
  position: fixed;
  display: none;
  flex-direction: row;
  height: 300px;
  color: dark-light-choose(darken($primary, 40%), blend-primary-secondary(90%));
  background-color: $secondary;
  border: 1px solid dark-light-diff($primary, $secondary, 90%, -60%);
}

.emoji-picker .categories-column {
  display: flex;
  flex-direction: column;
  flex: 1;
  align-items: center;
  justify-content: space-between;
  border-right: 1px solid dark-light-diff($primary, $secondary, 90%, -60%);
  min-width: 36px;
}

.emoji-picker .category-icon {
  display: block;
  margin: 4px auto;
  -webkit-filter: grayscale(100%);
  filter: grayscale(100%);

  button.emoji {
    margin: 0;
    padding: 0;
  }
}

.emoji-picker .category-icon.current, .emoji-picker .category-icon:hover {
  -webkit-filter: grayscale(0%);
  filter: grayscale(0%);
}

.emoji-picker .main-column {
  display: flex;
  flex-direction: column;
  flex: 20;
}

.emoji-picker .list {
  overflow-y: scroll;
  -webkit-overflow-scrolling: touch;
  padding: 0;
  flex: 1;
  flex-direction: column;
}

.emoji-picker .section-header {
  padding: 8px;
  margin-bottom: 4px;
  padding-bottom: 4px;
  border-bottom: 1px solid dark-light-diff($primary, $secondary, 90%, -60%);
  justify-content: space-between;
  display: flex;
  align-items: center;
}

.emoji-picker .section-header .title {
  color: $primary;
}

.emoji-picker .section-header .clear-recent .fa{
  margin: 0;
  padding: 0;
  color: dark-light-choose($header_primary-medium, $header_primary);

  &:hover {
    color: $primary;
  }
}

.emoji-picker .section-group {
  flex-wrap: wrap;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: 4px;
}

.emoji-picker .footer {
  align-items: center;
  display: flex;
  justify-content: space-between;
  border-top: 1px solid dark-light-diff($primary, $secondary, 90%, -60%);
}

.emoji-picker .info {
  text-overflow: ellipsis;
  padding-left: 8px;
  white-space: nowrap;
  overflow: hidden;
  font-weight: 700;
  max-width: 125px;
}

.emoji-picker .diversity-picker {
  display: flex;
  justify-content: flex-end;
  padding: 8px;
}

.emoji-picker .diversity-picker .diversity-scale {
  width: 20px;
  height: 20px;
  margin-left: 5px;
  border: 0;
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.emoji-picker .diversity-picker .diversity-scale.default { background: #ffcc4d; }
.emoji-picker .diversity-picker .diversity-scale.light { background: #f7dece; }
.emoji-picker .diversity-picker .diversity-scale.medium-light { background: #f3d2a2; }
.emoji-picker .diversity-picker .diversity-scale.medium { background: #d5ab88; }
.emoji-picker .diversity-picker .diversity-scale.medium-dark { background: #af7e57; }
.emoji-picker .diversity-picker .diversity-scale.dark { background: #7c533e; }

.emoji-picker .diversity-picker .diversity-scale.selected i {
  display: block;
}

.emoji-picker .diversity-picker i {
  display: none;
}

.emoji-picker .diversity-picker .d-icon {
  color: #fff;
  font-size: $font-0;
  text-shadow: 0.5px 1.5px 0 rgba(0,0,0,0.3);
}

.emoji-picker button.emoji {
  background: transparent;
  background-position: center;
  background-repeat: no-repeat;
  border-radius: 0;
  background-size: 20px 20px;
  -moz-box-sizing: content-box;
  box-sizing: content-box;
  height: 20px;
  border: 0;
  vertical-align: top;
  width: 20px;
  outline: none;
  padding: 3px;
  margin: 2px;
}

.emoji-picker .section-group button.emoji:hover, .emoji-picker .results button.emoji:hover {
  display: inline-block;
  vertical-align: top;
  border-radius: 2px;
  background-color: lighten($tertiary, 40%);
}

.wmd-emoji-button:before {
  content:  "\f118";
}

.emoji-picker-modal.fadeIn {
  z-index: z("modal","overlay");
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  opacity: .8;
  background-color: black;
}

.emoji-picker .filter {
  background-color: none;
  border-bottom: 1px solid dark-light-diff($primary, $secondary, 90%, -60%);
  padding: 5px;
  display: flex;
  position: relative;
  align-items: center;

  input[type="text"] {
    width: auto!important;
  }
}

.emoji-picker .filter .d-icon-search {
  color: dark-light-choose($header_primary-medium, $header_primary);
  font-size: $font-up-1;
  margin-left: 5px;
  margin-right: 5px;
}

.emoji-picker .filter input {
  height: 24px;
  margin: 0;
  flex: 1;
  border: none;
  box-shadow: none;
  padding-right: 24px;
  outline: none;
  color: $primary;
  background: $secondary;

  &:focus {
    border: none;
    box-shadow: none;
  }
}

.emoji-picker .filter input::-ms-clear {
  display: none;
}

.emoji-picker .results {
  display: none;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  padding: 4px;
  flex: 1;
}

.emoji-picker .filter .clear-filter {
  position: absolute;
  right: 5px;
  top: 12px;
  border: 0;
  background: none;
  color: dark-light-choose($header_primary-medium, $header_primary);
  outline: none;
  display: none;

  &:hover {
    color: $primary;
  }
}